Health Tip: What May Cause Cluster Headaches

(HealthDay News) -- Cluster headaches are bouts of severe, recurring pain on one side of the head. They may strike in clusters, occurring daily or several times a day for weeks at a time. The exact cause of cluster headaches isn't understood.

The University of Virginia Health System says risk factors for cluster headaches are thought to include:

• Drinking alcohol.
• Changes in barometric pressure.
• Sleep schedule changes.
• Using tobacco.
• Taking certain medications, including nitroglycerin.